NCLE Test Review Exam Study
Guide – Practice Questions with
Verified Answers. GRADED A+.
Latest 2026/2027 Update
Test that measures the quality of tears - correct answer ✔✔ -B.U.T. Test (Break
up time)
What is the O2 Permeability - correct answer ✔✔ -DK values of a lens
What are the disadvantages of Soft Lenses? - correct answer ✔✔ -Doesn't
correct irregular astigmatism, favors deposit formation
Which test measures the quantity of tears? - correct answer ✔✔ -The Schirmer
test.
,What are good results for the Schirmer test? - correct answer ✔✔ -15 mm in 5
minutes.
What are dry eye results for the Schirmer test? - correct answer ✔✔ -5-10 mm in
5 minutes.
Neovascularization is mainly due to what? - correct answer ✔✔ -Hypoxia,
corneal edema, tight contact lens fit
The Radii and Power of an average cornea - correct answer ✔✔ -7.85 mm or
43.00 D What are the layers of the cornea? - correct answer ✔✔ -Epithelium,
Bowman's membrane, Stroma, Descemet's membrane, Endothelium
The main disadvantage of soft contact lenses - correct answer ✔✔ -Protein
deposits
What is it called when contact lenses are used to correct high myopia? - correct
answer ✔✔ -Orthokeratology (Ortho-K)
A contact lens with diameter that is larger than the cornea is a hydrophobic or
hydrophilic lens? - correct answer ✔✔ -Hydrophilic lens
, Which of the following curves indicates the flattest base curve:7.50 mm, 37.50 D,
8.60 mm, 49.00 D? - correct answer ✔✔ -37.50 D
A CTL was ordered with a BC of 7.85 mm but was received from the lab with a BC
of 7.80 mm. The BC of the actual lens is _____. - correct answer ✔✔ -.25 D
steeper than the ordered CTL.
A CTL with a BC of 7.42 mm is fitting too, a tighter fit may be achieved by
changing the base curve to: 7.46 , 7.85 mm, 8.04 mm, none of these? - correct
answer ✔✔ -none of these... S.S.S. rule
A CTL has a BC of 7.50 mm, what would the PPC most likely be? 7.45 mm, 42.50
D, 7.35 mm, 30.00 D - correct answer ✔✔ -30.00 D= 11.25 mm/S.S.S. Rule
What does the term haptic Lens refer to? - correct answer ✔✔ -A scleral CTL size
The secondary curve of a RGP CTL is generally flatter or steeper than the CPC and
by how much? - correct answer ✔✔ -flatter by 2-4 diopters
When the power of a curve changes by 0.50 D, the radius of curvature changes
by approximately how much? - correct answer ✔✔ -0.10 mm
When the CPC of a CTL measures 7.5 mm radius, how much is the power in
diopters? - correct answer ✔✔ -45.00 D
Guide – Practice Questions with
Verified Answers. GRADED A+.
Latest 2026/2027 Update
Test that measures the quality of tears - correct answer ✔✔ -B.U.T. Test (Break
up time)
What is the O2 Permeability - correct answer ✔✔ -DK values of a lens
What are the disadvantages of Soft Lenses? - correct answer ✔✔ -Doesn't
correct irregular astigmatism, favors deposit formation
Which test measures the quantity of tears? - correct answer ✔✔ -The Schirmer
test.
,What are good results for the Schirmer test? - correct answer ✔✔ -15 mm in 5
minutes.
What are dry eye results for the Schirmer test? - correct answer ✔✔ -5-10 mm in
5 minutes.
Neovascularization is mainly due to what? - correct answer ✔✔ -Hypoxia,
corneal edema, tight contact lens fit
The Radii and Power of an average cornea - correct answer ✔✔ -7.85 mm or
43.00 D What are the layers of the cornea? - correct answer ✔✔ -Epithelium,
Bowman's membrane, Stroma, Descemet's membrane, Endothelium
The main disadvantage of soft contact lenses - correct answer ✔✔ -Protein
deposits
What is it called when contact lenses are used to correct high myopia? - correct
answer ✔✔ -Orthokeratology (Ortho-K)
A contact lens with diameter that is larger than the cornea is a hydrophobic or
hydrophilic lens? - correct answer ✔✔ -Hydrophilic lens
, Which of the following curves indicates the flattest base curve:7.50 mm, 37.50 D,
8.60 mm, 49.00 D? - correct answer ✔✔ -37.50 D
A CTL was ordered with a BC of 7.85 mm but was received from the lab with a BC
of 7.80 mm. The BC of the actual lens is _____. - correct answer ✔✔ -.25 D
steeper than the ordered CTL.
A CTL with a BC of 7.42 mm is fitting too, a tighter fit may be achieved by
changing the base curve to: 7.46 , 7.85 mm, 8.04 mm, none of these? - correct
answer ✔✔ -none of these... S.S.S. rule
A CTL has a BC of 7.50 mm, what would the PPC most likely be? 7.45 mm, 42.50
D, 7.35 mm, 30.00 D - correct answer ✔✔ -30.00 D= 11.25 mm/S.S.S. Rule
What does the term haptic Lens refer to? - correct answer ✔✔ -A scleral CTL size
The secondary curve of a RGP CTL is generally flatter or steeper than the CPC and
by how much? - correct answer ✔✔ -flatter by 2-4 diopters
When the power of a curve changes by 0.50 D, the radius of curvature changes
by approximately how much? - correct answer ✔✔ -0.10 mm
When the CPC of a CTL measures 7.5 mm radius, how much is the power in
diopters? - correct answer ✔✔ -45.00 D
